head to head
Neither is simply harder - they are hard in different places. Digimon World: Next Order demands more variance; Portal demands more execution.

Optimization · Pure Optimization
Modern revival of the Digimon World raising formula with two partners and mapped-but-hidden evolution rules.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Digimon World: Next Order leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Digimon World: Next Order
Battles are mostly automated with order timing
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Digimon World: Next Order
No adaptive opposition
Portal
No adversary modeling player.
Digimon World: Next Order leans clearly harder on variance.
Digimon World: Next Order
Hidden evolution conditions and lifespan rolls
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Digimon World: Next Order
Training schedules and care routines are fully solvable
Portal
Pure puzzle-solving optimization.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.